Q1: Distillation column is used to separate n-butane, n-pentane, n-hexane from n-heptane and n-octane, the distillation column operates at 1.2 atm with reflux ratio 1.5. The feed is precooled so that it enters the column with a molar condensation ratio equal to 1. Composition (mole/h) of the feed, top and bottom are recorded in the following Table. dij Components Feed (mol/h) Top flow Bottom flow rate(mol/h) rate (mol/h) 15 0 22 0 15 22 n-butane n-pentane n-hexane n-heptane n-octane 24 25 36 38 4.2 3.8 2.0 1.0 0.38 6 30 0 38 (i) Identify the key and non-key components. [1.0 mark] (ii) Calculate minimum number of stages using Fenske's equation [1.0 mark] (iii) Determine the number of ideal stage if reflux ratio is 1.3 Rmin using Gilliland's equation [2.0 marks]